A blunder or not?

The Polish Grandmaster Radoslaw Wojtaszek is known for his strong white color. After his loss in round three against Anish Giri in Qatar he wanted to recover as quick as possible with the white pieces. Things did not go so well for him at the beginning of his game against the yesterday's hero D. Vocaturo:
A game that I liked (ChessBase 13)

[Event "Qatar Masters Open"]
[Site "?"]
[Date "2015.12.23"]
[Round "4.14"]
[White "Wojtaszek, Radoslaw"]
[Black "Vocaturo, Daniele"]
[Result "1-0"]
[WhiteElo "2723"]
[BlackElo "2597"]
[Annotator "Bojkov, Dejan"]
[PlyCount "75"]
[EventDate "2015.??.??"]
[WhiteClock "0:09:06"]
[BlackClock "0:01:36"]

1. d4 e6 2. c4 Bb4+ {Diagram [#] How to name this opening? Advanced
Bogo-Indian? Or flexible Bogo-Indian?} 3. Bd2 Bxd2+ 4. Qxd2 Nf6 5. Nc3 d5 6. e3
{Wojtaszek wants to develop his knight on e2.} ({Now} 6. Nf3 {will switch
into proper Bogo-Indian and this move was a choice of Mamedyarov and Bacrot
among others.}) 6... O-O 7. cxd5 ({The move} 7. Nf3 {is still possible, for
example} Qe7 8. Qc2 c6 9. Bd3 dxc4 10. Bxc4 Nbd7 11. O-O e5 12. Bb3 exd4 13.
exd4 {and White was better in Riazantsev,A (2646)-Roiz,M (2600) Berlin 2015})
7... exd5 8. Bd3 Nc6 {[%csl Yc8,Yd3][%cal Gc6e7,Gc8f5] Diagram [#] This was
played only once before but seems very, very logical. In the arising Carlsbad
pawn structure Black would love to swap off the light-squared bishops. In
the usual Carlsbad the black queenside knight is already on d7 and in order to
achieve the desired trades the knight has to take the long route via f8-e6-g7
and on the top of this Black has to spend time on Rf8-e8 and g7-g6. Vocaturo
is more clever, he creates the positional threat in just two moves.} 9. Nge2
Ne7 10. Qc2 {Stops Bc8-f5.} g6 $146 {Diagram [#] A novelty. Black consistently
plays for Bc8-f5.} ({The only predecessor saw} 10... b6 11. b4 c6 12. Rb1 Bd7
13. O-O {with slight but long-lasting advantage for White, Vaisser,A (2555)
-Bricard,E (2460) France 1993}) 11. h3 {Agressive play. White wants to prove
that g7-g6 was not perfect and that the kingside is weak as well.} (11. O-O Bf5
{should be fine for Black.}) 11... Bf5 12. g4 Bxd3 13. Qxd3 {"I thought this
position is promising for me" Wojtaszek "but Black's next move is very strong."
} Nc8 $1 {[%csl Ge4][%cal Gc8d6,Gd6c4,Gd6e4,Gf6e4] Diagram [#] The knight is
heading for the optimal d6 square and then it will have the pleasant choice
between the e4 and c4 beauties.} 14. O-O-O Nd6 15. f3 {If White had now the
time to play Ne2-g3 followed by g4-g5 everything would be great, but...} Re8
16. Nf4 {White found nothing better than this move, but it has a flaw.} ({
It transpires that} 16. Ng3 {is too slow due to} b5 $1 {[%csl Re4][%cal Rb5b4]
Diagram [#]} 17. e4 ({Worse is} 17. Nxb5 Nc4 $1 ({Or} 17... Nxb5 18. Qxb5 Rxe3
{in both cases with advantage for Black.})) 17... dxe4 (17... b4 18. Nxd5 Nxd5
19. exd5 Qg5+ $17 {is even stronger.}) 18. fxe4 b4 {with Black's edge
(Wojtaszek)}) ({Black is also doing great after} 16. g5 Nh5 17. Nxd5 Qxg5 {
(Wojtaszek)}) 16... c6 17. h4 Nc4 $1 18. e4 Qd6 $1 {[%cal Rd6b4,Rb4b2,Rd6f4]
Diagram [#] A very nice maneuver, missed by the Polish GM.} 19. e5 Qb4 {
With the double threat of checkmate in one and Nc4xe5! Wojtaszek thought for a
moment that he is lost, but then managed to put himself together and found an
excellent resource.} 20. Qe2 $1 {[%csl Rf4][%cal Ga2a3] Diagram [#]} ({White
also calculated the line} 20. Qc2 Ne3 21. Qd2 Nxd1 22. Kxd1 Nd7 23. h5 {
but came to the conclusion that there is not enough compensation after} c5 ({
Or first} 23... Nb6)) 20... Nxe5 21. a3 {The black queen feels overburdened.}
Qc4 22. g5 $1 {Diagram [#]} Nfd7 (22... Qxe2 23. Ncxe2 {drops a piece.}) 23.
Qc2 $1 {Suddenly, the black knight is in danger.} ({Wojtaszek dismissed} 23.
Qd2 {due to the pretty resource} Nc5 $1 {Diagram [#]} 24. dxc5 Nxf3 $17) ({
He also did not like} 23. Qh2 $5 {for the same reason-} Nc5 {but here he
missed a simple move for White in the line} ({However, Black can play for
compensation with} 23... b5 $5 24. Kb1 (24. dxe5 Nxe5 25. Kb1 a5) 24... a5 {
and nothing is clear at all.}) 24. dxe5 (24. dxc5 Nxf3 25. Qg3 Re3 {is indeed
good for Black (Wojtaszek)}) 24... d4 25. Qe2 $1 {and White wins a piece.})
23... Nxf3 ({The familiar trick} 23... Nc5 {was still there when Black can
save the knight but lose precious time. Wojtaszek planned} 24. Kb1 Ned7 {
and now either} 25. Nfxd5 ({But not} 25. Ncxd5 cxd5 $1) (25. h5 $1 {with
strong attack is also great for White.}) 25... cxd5 26. dxc5 {with advantage
for White.}) ({Black can sacrifice the knight for three pawns in the line}
23... Nf8 24. b3 Qa6 25. dxe5 Qxa3+ 26. Qb2 Qxb2+ 27. Kxb2 Rxe5 {but it is
clear that White has the better chances.}) 24. Qf2 $1 {[%csl Rf3] Diagram [#]
The queen dance is over, the knight is trapped.} Nde5 25. Kb1 (25. dxe5 $2
Qxf4+) 25... Nxd4 $2 {A time-trouble blunder.} ({White expected} 25... Rad8 {
(to stop the knight sacrifice on d5)} 26. dxe5 Nxe5 (26... Qxf4 27. Rd3 {
In both cases White has the upper hand but there is plenty of play ahead.}))
26. Rxd4 Qc5 27. Ncxd5 {The correct idea, but in the wrong move order.} ({Not}
27. h5 Nf3 $1 {(Wojtaszek)}) ({However, the preliminary} 27. Rc1 $1 {and only
after} Qf8 28. Ncxd5 $1 {Diagram [#] was the correct move order.} cxd5 29. Nxd5
) 27... cxd5 28. Rc1 (28. Nxd5 Nf3 $1 {is again good for Black.}) 28... Qf8 $2
{Now the attack is unstoppable.} ({Correct was} 28... Qb5 $1 29. a4 (29. Nxd5
$2 Nd3 $1) 29... Qa6 30. Nxd5 Nd3 31. Nf6+ Kh8 {when nothing is clear. Most
likely the players should split the point after something like} 32. Qf3 Nxc1
33. Nxe8 Rxe8 34. Qxf7 Qe2 35. Kxc1 Qe1+ 36. Kc2 Rc8+ 37. Rc4 Qe2+ 38. Kb3 Qd3+
39. Rc3 Qd1+ 40. Ka2 Qxa4+ 41. Ra3 Qc4+ 42. Qxc4 Rxc4 43. Rxa7 Rxh4 44. Rxb7
Ra4+ 45. Kb3 Ra5 46. Rb8+ $11 {Diagram [#]}) 29. Nxd5 {Once that the knight
occupies f6 outpost, the "h" pawn will rush in and open the file for the heavy
pieces.} Rec8 30. Re1 Nc6 31. Rde4 (31. Nf6+ Kh8 32. Rd7 $18) 31... Rd8 32.
Nf6+ {[%csl Gf6,Yg8,Rh7][%cal Rh1h7] Diagram [#]} Kh8 33. h5 gxh5 34. Rh1 Rd6
35. Rxh5 Rxf6 36. gxf6 (36. Qxf6+ Qg7 37. Reh4 $18) 36... Qd6 37. Rxh7+ $1 Kxh7
38. Qf5+ {[%csl Rh7] Diagram [#] Black resigned as it is mate in three.} (38.
Qf5+ Kh8 39. Rh4+ Kg8 40. Qg4+ Kf8 41. Rh8#) 1-0


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